气候变化领域集成服务门户(CCPortal): Vertical Co9S8 hollow nanowall arrays grown on a Celgard separator as a multifunctional polysulfide barrier for high-performance Li-S batteries

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DOI	10.1039/c8ee00893k
	Vertical Co9S8 hollow nanowall arrays grown on a Celgard separator as a multifunctional polysulfide barrier for high-performance Li-S batteries
	He J.; Chen Y.; Manthiram A.
发表日期	2018
ISSN	17545692
起始页码	2560
结束页码	2568
卷号	11 期号:9
英文摘要	Lithium-sulfur (Li-S) batteries have been regarded as one of the most promising next-generation energy-storage devices, due to their low cost and high theoretical energy density (2600 W h kg-1). However, the severe dissolution of lithium polysulfides (LiPSs) and the fatal shuttle effect of the sulfur cathode seriously hinder the practical applications of Li-S batteries. To address such issues, we present here, for the first time, a novel metal organic framework (MOF)-derived Co9S8 nanowall array with vertical hollow nanoarchitecture and high electrical conductivity, which is grown in situ on a Celgard separator (Co9S8-Celgard) via a feasible and scalable liquid-reaction approach, as an efficient barrier for LiPSs in Li-S batteries. Benefiting from the direct in situ growth of vertical Co9S8 hollow nanowall arrays as a multifunctional polar barrier, the Co9S8-Celgard separator possesses large surface area, excellent mechanical stability, and particularly strong LiPS-trapping ability via chemical and physical interactions. With these advantages, even with a pure sulfur cathode with a high sulfur loading of 5.6 mg cm-2, the Li-S cells with the Co9S8-Celgard separator exhibit outstanding electrochemical performance: the initial specific capacity is as high as 1385 mA h g-1 with a retention of 1190 mA h g-1 after 200 cycles. The cells deliver a high capacity of 530 mA h g-1 at a 1C rate (1675 mA g-1) even after an impressive number of 1000 cycles with an average capacity fade of only 0.039% per cycle, which is promising for long-term cycling application at high charge/discharge current densities, and pouch-type Li-S cells with the Co9S8-Celgard separator display excellent cycling performance. When the optimized cathode with the sulfur loading in well-designed yolk-shelled carbon@Fe3O4 (YSC@Fe3O4) nanoboxes is employed, the cell with Co9S8-Celgard delivers a high initial capacity of 986 mA h g-1 at a 1C rate with a capacity retention as high as 83.2% even after a remarkable number of 1500 cycles. This work presents a strategy to grow on the separator a multifunctional polar interlayer with unique nanoarchitecture and high conductivity to chemically and physically trap the LiPSs, thus significantly enhancing the performance of Li-S batteries. © 2018 The Royal Society of Chemistry.
英文关键词	Cathodes; Cells; Chemical stability; Crystalline materials; Cytology; Iron oxides; Lithium batteries; Lithium compounds; Magnetite; Mechanical stability; Organometallics; Phosphorus compounds; Polysulfides; Separators; Capacity retention; Cycling performance; Electrochemical performance; High electrical conductivity; Large surface area; Metal organic framework; Physical interactions; Specific capacities; Lithium sulfur batteries; array; electrical conductivity; electrochemical method; electrode; energy storage; equipment; fuel cell; in situ measurement; performance assessment; physicochemical property; polymer
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/190153
作者单位	Materials Science and Engineering Program and Texas Materials Institute, University of Texas at Austin, Austin, TX 78712, United States; State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, China
推荐引用方式 GB/T 7714	He J.,Chen Y.,Manthiram A.. Vertical Co9S8 hollow nanowall arrays grown on a Celgard separator as a multifunctional polysulfide barrier for high-performance Li-S batteries[J],2018,11(9).
APA	He J.,Chen Y.,&Manthiram A..(2018).Vertical Co9S8 hollow nanowall arrays grown on a Celgard separator as a multifunctional polysulfide barrier for high-performance Li-S batteries.Energy & Environmental Science,11(9).
MLA	He J.,et al."Vertical Co9S8 hollow nanowall arrays grown on a Celgard separator as a multifunctional polysulfide barrier for high-performance Li-S batteries".Energy & Environmental Science 11.9(2018).